Turner, painted propaganda, and the birth of Modern Europe

Very interesting such history painting being a major theme that painters were to react against. I think there are still major differences below and above the line of Roman occupation. Many thanks for your efforts!

Here, my puzzle is The Opening of the Wallhalla, 1842 (1843), which shows a classical building resembling the Parthenon in Athens, and a huge crowd of people gathered on the opposite bank of the river below it. Valhalla is, of course, the mythical majestic hall to which half of the Vikings went when they died in battle, in preparation for Ragnarök.

The Walhalla (to spell it correctly) which Turner shows is a very long way from the lands of the…